cmake: add rule to run kernel with qemu monitor on stdio

arch/x86_64/QEMU.cmake

@@ -22,3 +22,12 @@ add_custom_target(debug-kernel
 			-o "gdb-remote localhost:1234"
 	USES_TERMINAL
 	DEPENDS ${kernel_name} bsp)
+
+add_custom_target(run-kernel-monitor
+	COMMAND
+		${QEMU}
+		-kernel $<TARGET_FILE:${kernel_name}>
+		-initrd ${sys_dir}/${bsp_name}
+		-m 1G -monitor stdio
+	USES_TERMINAL
+	DEPENDS ${kernel_name} bsp)